Different bird than on XC135338 - XC135340 (though featuring in the background there); same bird on XC135341 - XC135342. This recording immediately follows XC135341. After singing for an hour or so without much if any accelerations, as soon as the background bird begins singing at a spot near this bird, 8 seconds into this recording, the bird starts including accelerations.

Different bird than on XC135338 - XC135340 (though featuring in the background there); same bird on XC135341 - XC135342. Here without any (complete) accelerations: it sang like this non-stop for over an hour.

A male quacking along in the reed, rather distant. The typical accelerando was heard only once in the whole evening. It happened to be recorded in the background of XC211466, at 0:55. No wind, +10 degrees. (Old tape recording.)